diff options
Diffstat (limited to 'drivers/iommu/iommufd')
| -rw-r--r-- | drivers/iommu/iommufd/selftest.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/iommu/iommufd/selftest.c b/drivers/iommu/iommufd/selftest.c index 6684ab4cdc7a..a11d29f368ff 100644 --- a/drivers/iommu/iommufd/selftest.c +++ b/drivers/iommu/iommufd/selftest.c @@ -1195,14 +1195,15 @@ static int iommufd_test_dirty(struct iommufd_ucmd *ucmd, unsigned int mockpt_id, unsigned long page_size, void __user *uptr, u32 flags) { - unsigned long bitmap_size, i, max = length / page_size; + unsigned long bitmap_size, i, max; struct iommu_test_cmd *cmd = ucmd->cmd; struct iommufd_hw_pagetable *hwpt; struct mock_iommu_domain *mock; int rc, count = 0; void *tmp; - if (iova % page_size || length % page_size || !uptr) + if (!page_size || !length || iova % page_size || length % page_size || + !uptr) return -EINVAL; hwpt = get_md_pagetable(ucmd, mockpt_id, &mock); @@ -1214,6 +1215,7 @@ static int iommufd_test_dirty(struct iommufd_ucmd *ucmd, unsigned int mockpt_id, goto out_put; } + max = length / page_size; bitmap_size = max / BITS_PER_BYTE; tmp = kvzalloc(bitmap_size, GFP_KERNEL_ACCOUNT); |